EXHIBIT 10.19

                               NEW NOTE AGREEMENT


         THIS  AGREEMENT  is  made  effective  as of  the  1st  day of
November,   1996,  by  and  among  EMCON,  a  California   corporation
("EMCON"),  Organic Waste Technologies,  Inc., a Delaware corporation,
("OWT"),  and the  undersigned  holders of common  stock  ("Shares  at
Issue") of OWT and holders of options to purchase  the common stock of
OWT  ("Options  at  Issue")  listed  on  the  signature  pages  hereto
(collectively,    the   holders    thereof   being   the   "Management
Stakeholders").

         WHEREAS,  the  Management  Stakeholders  are  parties to that
certain  Rescission and Reformation  Agreement dated as of November 1,
1996 by and  among the  Management  Stakeholders,  OWT and EMCON  (the
"Rescission Agreement");

         WHEREAS,   pursuant  to  the   Rescission   Agreement,   each
Management  Stakeholder has agreed to the  cancellation of the Options
at Issue held by him in exchange for an unfunded, unsecured promise of
OWT to pay certain  sums,  and the exchange of Shares at Issue held by
him  for a  new  convertible  note  made  by  OWT  (collectively,  the
"Notes");

         WHEREAS, in connection  therewith,  the parties hereto desire
to enter into additional agreements regarding the Notes;

         WHEREAS, EMCON desires to lend each Management Stakeholder an
amount equal to any additional  federal,  state and local income taxes
(the "Tax  Liability")  paid by him as a result of the cancellation of
the  Options in exchange  for an  unfunded,  unsecured  promise to pay
certain  sums and the exchange of the Shares at Issue owned by him for
a Note (the "Loan Amount").

         NOW,  THEREFORE,  in  consideration  of the foregoing and the
agreements  set forth  below,  the  parties  agree  with each other as
follows:

         1. LOAN.  Upon the date on which any  amounts  are  withheld  by OWT or
EMCON for each Management  Stakeholder's  Tax Liability or paid directly by such
Management  Stakeholder to the appropriate taxing authority,  EMCON shall pay to
such  Management  Stakeholder  an  amount  equal  to  such  withholding  or  Tax
Liability,  by cashier's check or wire transfer, and such Management Stakeholder
shall execute a note in the principal amount of the Loan Amount,  in the form of
Exhibit A hereto (the "Loan Note").

         2. (a)  EXCHANGE  RIGHT.  In the event that the Note or the Option Base
Amount (as defined in the Rescission  Agreement) has not been converted into OWT
Common Stock in accordance with its terms prior to the fifth  anniversary of the
date hereof,  each Management  Stakeholder shall have the right, for a period of
ninety (90) days prior to the fifth  anniversary of the date hereof, to exchange
the Note payable to him for fully paid and nonassessable shares of Common Stock,
no par value,  of EMCON as such stock exists on the date of issuance of the Note
payable  to him and the  date of the  Rescission  Agreement,  or any  shares  of


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capital  stock of EMCON  into which such  stock  shall  hereafter  be changed or
reclassified  (the "EMCON  Common  Stock") at the exchange  price  determined as
provided  herein (the "EMCON Exchange  Price").  Upon the surrender of the Note,
accompanied  by a Notice of Exchange of  Convertible  Note in the form  attached
hereto as  Exhibit B with  respect to both the amount due under the Note and the
Option Base  Amount,  properly  completed  and duly  executed by the  Management
Stakeholder (an "Exchange Notice"), EMCON shall issue and deliver to or upon the
order of the Management  Stakeholder that number of shares of EMCON Common Stock
for which the sum of the  Principal (as defined in the Note) and the Option Base
Amount shall be  exchanged,  as determined  in  accordance  herewith.  Upon such
exchange,  any accrued but unpaid interest on the Notes shall be immediately due
and payable.

         The number of shares of EMCON Common Stock to be issued upon conversion
of each Note and Option Base Amount shall be  determined  by dividing the sum of
the  Principal  of such  Note and the  Option  Base  Amount  of such  Management
Stakeholder  by the EMCON  Exchange  Price in  effect  on the date the  Exchange
Notice is delivered to EMCON by the Management Stakeholder.

             (b) EXCHANGE  PRICE.  The EMCON Exchange  Price shall  initially be
$6.50.

                 (i) SUBDIVISIONS. In case EMCON shall at any time subdivide the
outstanding  shares of EMCON Common Stock,  the EMCON  Exchange  Price in effect
immediately prior to such subdivision shall be proportionately decreased, and in
case the  Company  shall at any time  combine  the  outstanding  shares of EMCON
Common Stock, the Exchange Price in effect immediately prior to such combination
shall be  proportionately  increased,  effective at the close of business on the
date of such subdivision or combination, as the case may be.

                 (ii) STOCK  DIVIDENDS.  In case  EMCON  shall at any time pay a
dividend with respect to EMCON Common Stock payable in EMCON Common Stock,  then
the EMCON  Exchange  Price in effect  immediately  prior to the record  date for
distribution  of such  dividend  shall be adjusted to that price  determined  by
multiplying the EMCON Exchange Price in effect  immediately prior to such record
date by a  fraction  (i) the  numerator  of which  shall be the total  number of
shares of Common Stock  outstanding  immediately prior to such dividend and (ii)
the  denominator  of which shall be the total  number of shares of EMCON  Common
Stock outstanding immediately after such dividend.

                 (iii)    RECLASSIFICATION   OR   MERGER.   In   case   of   any
reclassification,  change or conversion of the EMCON Common Stock (other than as
a result of a subdivision or combination described above and other than upon any
Acceleration  Event, as defined below),  each Management  Stakeholder shall have
the right to receive, upon exchange of the Note owned by him and satisfaction of
the  promise  to pay the  Option  Base  Amount  the kind and amount of shares of
stock,   other   securities,   money   and   property   receivable   upon   such
reclassification,  change or  conversion  by a holder of the number of shares of
EMCON Common Stock the number of EMCON Common Shares into which his Note and his
respecting  Option Base Amount could then be exchanged.  The  provisions of this
subparagraph  (iii)  shall  similarly  apply  to  successive  reclassifications,
changes, and conversions.

             (c) AUTHORIZED  SHARES.  EMCON covenants that during the period the
exchange  right set forth in this Section 2 exists,  EMCON will reserve from the
authorized  and unissued  EMCON  Common  Stock a sufficient  number of shares to
provide for the  issuance of EMCON  Common  Stock upon the full  exchange of the
Notes and the Option Base Amounts.  EMCON  represents  that upon issuance,  such
shares will be duly and validly issued, fully paid and non-assessable.

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             (d) METHOD OF EXCHANGE. Except as otherwise provided in the Note or
the Rescission Agreement, or agreed by the Management Stakeholder, the Note held
by him and his respective  Option Base Amount may be exchanged by the Management
Stakeholder  in whole by (i)  submitting  to EMCON an  Exchange  Notice and (ii)
surrendering the Note held by him at the principal office of EMCON.

             (e) RESTRICTIONS  CONCERNING THE SHARES. The shares of EMCON Common
Stock to be held by  Management  Stakeholders  pursuant  to the  exercise of the
exchange  rights  set forth in Section 2 may not be sold or  transferred  unless
either (i) such shares first shall have been registered under the Securities Act
of 1933 (the "Act") and  applicable  state  securities  laws or (ii) EMCON shall
have been  furnished  with an opinion of legal  counsel to the effect  that such
sale or transfer is exempt from the registration requirements of the Act and all
applicable  state  securities  laws. Each certificate for shares of EMCON Common
Stock to be held by the Management Stakeholders that have not been so registered
and that have not been sold pursuant to an exemption that permits removal of the
legend, shall bear a legend substantially in the following form, as appropriate:

          THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
          REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED. THE
          SECURITIES  HAVE BEEN ACQUIRED FOR INVESTMENT AND MAY NOT BE
          SOLD, TRANSFERRED OR ASSIGNED IN THE ABSENCE OF AN EFFECTIVE
          REGISTRATION   STATEMENT  FOR  THE   SECURITIES   UNDER  THE
          SECURITIES ACT OF 1933, AS AMENDED, OR AN OPINION OF COUNSEL
          THAT REGISTRATION IS NOT REQUIRED UNDER SAID ACT.

Upon the request a  Management  Stakeholder,  EMCON shall  remove the  foregoing
legend from the  certificate  representing  the EMCON  Common Stock held by such
Management  Stakeholder upon exercise of the exchange rights pursuant to Section
2 or issue to such Management Stakeholder a new certificate therefor free of any
transfer legend, if, with such request,  EMCON shall have received either (i) an
opinion of counsel to the effect that any such  legend may be removed  from such
certificate, or (ii) if the present paragraph (k) of Rule 144 or a substantially
similar successor rule remains in force and effect, satisfactory representations
from the Management  Stakeholder  that such Management  Stakeholder is not then,
and has not been during the preceding  three (3) months,  an affiliate of EMCON,
and that a period of at least three (3) years has elapsed since the later of the
date the securities  were acquired (as determined  under Rule 144) from EMCON or
an affiliate of EMCON.

             (f)  ACCELERATION OF EXCHANGE RIGHTS.  Notwithstanding  anything to
the contrary herein,  in the event that any of the following events set forth in
paragraphs (i) through (v) of this Section 2(f) (each, an "Acceleration  Event")
shall occur,  then the exchange  rights set forth in Section 2(a) shall,  at the
option of each Management Stakeholder, be immediately exercisable:

                 (i) by any  Management  Stakeholder  upon  a  consolidation  or
merger of EMCON with or into any other corporation or corporations (other than a
wholly-owned  subsidiary  of EMCON and other than a merger in which EMCON is the
surviving  corporation),  or the sale,  transfer or other  disposition of all or
substantially all of the assets of EMCON;

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                 (ii) by any Management Stakeholder,  upon a change in ownership
of Fifty Percent (50%) or more,  in a single  transaction,  of the stock of OWT,
other than to an  affiliate  or  affiliates  of EMCON which does not  materially
alter EMCON's direct or indirect ownership of OWT;

                 (iii) by any Management Stakeholder, upon a change in ownership
of Fifty Percent (50%) or more, in a series of two (2) or more transactions,  of
the  outstanding  stock of OWT,  other than to an affiliate or affiliates of OWT
and a  substantial  diminution  in the  responsibilities  of Mark H. Shipps with
respect to OWT in his capacity as an employee of EMCON;

                 (iv) (A) upon a change  in  ownership  of  Thirty-Five  Percent
(35%) or more of the stock of EMCON to a single buyer or an affiliated  group of
buyers, resulting in a change in the majority of the board of directors of EMCON
from the board of  directors as it existed  immediately  prior to such change in
ownership,  or (B) upon a change in ownership of Fifty Percent (50%) or more, in
a single transaction, of the stock of EMCON;

                 (v)  by  any  Management  Stakeholder,  upon  the  liquidation,
dissolution or winding up of OWT or the  consolidation or merger of OWT with and
into  another  corporation  (other  than a merger in which OWT is the  surviving
corporation);

                 (vi) by any Management Stakeholder,  upon the occurrence of any
transaction,  without the consent of Mark H.  Shipps,  in which  Twenty  Percent
(20%) or more of the  outstanding  common stock of OWT becomes  owned by persons
other than EMCON or an affiliate or affiliates of EMCON;

                 (vii)  by any  Management  Stakeholder  upon  his  death or the
termination  of his  employment by OWT other than a Termination  for Cause,  the
"Termination  for  Cause"  is  intended  to  embrace  intentionally  or  grossly
negligent  conduct on the part of the Maker which is materially  detrimental  to
the operations  and/or  reputation of OWT or the Holder.  By way of illustration
such actions  would  include (but would not be limited to) a material  breach of
Maker's  obligations  under any employment  agreement  between the Maker and OWT
and/or the Holder,  and/or  conviction of a crime (other than minor  infractions
such as parking or similar traffic  violations),  moral turpitude and revocation
by the applicable licensing authority of professional licenses (if any) material
to the Maker's ability to perform the Maker's employment obligations; or

                 (viii) by any Management  Stakeholder upon a fundamental change
in EMCON's current strategy of focussing a material amount of EMCON's  resources
on services  relating  to the design,  construction,  ownership,  operation  and
maintenance of infrastructure.

         3. REQUEST FOR REGISTRATION.

             (a) Upon the receipt by EMCON of Exchange  Notices from  Management
Stakeholders  holding Notes, the aggregate  Principal of which together with the
Option Base Amounts owed to such Management  Stakeholders,  may be exchanged for
EMCON Common Stock with an aggregate value, based on the closing price of the


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EMCON Common Stock on the principal  market on which such stock is traded on the
date of such Exchange Notices, $1,000,000 or more, EMCON will:

                 (i) promptly file a registration  statement with the Securities
and Exchange  Commission (the  "Commission") and effect all such  registrations,
qualifications and compliances (including,  without limitation, the execution of
an undertaking to file  post-effective  amendments,  appropriate  qualifications
under the applicable  blue sky or other state  securities  laws and  appropriate
compliance with exemptive  regulations  issued under the Securities Act of 1933,
as amended (the "Securities  Act"), and any other  governmental  requirements or
regulations)  as would permit or facilitate the sale and  distribution of all of
the EMCON  Common  Stock  issuable  upon the full  exchange  of the Notes by the
Management  Stakeholders  and the  cancellation  of (the  "Management  Shares");
provided,   however,   that  EMCON  shall  not  be   obligated  to  effect  such
registration, qualification or compliance pursuant to this Section 3(a)(i)(A) in
any  particular  jurisdiction  in which  EMCON  would be  required  to execute a
general consent to service of process unless EMCON is already subject to service
in such  jurisdiction and except as required by the Securities Act and (B) after
EMCON has already effected one such registration, qualification or compliance;

                 (ii) promptly give notice to all Management Stakeholders of the
expected registration of the Management Shares;

                 (iii) use its best  efforts  to cause such  registration  to be
declared effective by the Commission;

                 (iv) keep such registration statement effective for a period of
one year or until the Management  Stakeholders  have completed the  distribution
described in the registration statement, whichever first occurs;

                 (v) prepare and file with the  Commission  such  amendments and
supplements to such registration statement and the prospectus used in connection
with  such  registration  statement  as may be  necessary  to  comply  with  the
provisions  of  the  Securities  Act  with  respect  to the  disposition  of all
securities offered by such registration statement;

                 (vi) furnish such number of  prospectuses  and other  documents
incident thereto, including any amendment of or supplement to the prospectus, as
a Management Stakeholder from time to time may reasonably request;

                 (vii) notify each Management  Stakeholder  selling EMCON Common
Stock  covered  by such  registration  statement  at any time when a  prospectus
relating  thereto is required to be delivered  under the  Securities  Act of the
happening  of any  event as a result of which the  prospectus  included  in such
registration  statement,  as then in effect,  includes an untrue  statement of a
material fact or omits to state a material fact required to be stated therein or
necessary to make the  statements  therein not  misleading  or incomplete in the
light  of the  circumstances  then  existing,  and at the  request  of any  such
Management  Stakeholder,  prepare and furnish to such  Management  Stakeholder a
reasonable  number  of  copies  of a  supplement  to or  an  amendment  of  such
prospectus  as  may  be  necessary  so  that,  as  thereafter  delivered  to the
purchasers of such shares, such prospectus shall not include an untrue statement
of a  material  fact or omit to state a  material  fact  required  to be  stated
therein or necessary to make the statements therein not misleading or incomplete
in the light of the circumstances then existing;

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                 (viii) cause all such EMCON Common  Stock  registered  pursuant
hereunder to be listed on each  securities  exchange,  if any, on which  similar
securities issued by EMCON are then listed;

                 (ix)  otherwise  use  its  best  efforts  to  comply  with  all
applicable rules and regulations of the Commission; and

                 (x) in connection with any underwritten  offering pursuant to a
registration   statement   filed  pursuant  to  this  Section,   enter  into  an
underwriting  agreement  reasonably  necessary  to effect  the offer and sale of
EMCON Common Stock,  provided such  underwriting  agreement  contains  customary
underwriting provisions and provided further that if the underwriter so requests
the underwriting agreement will contain customary contribution provisions.

             (b)  During the  period  that  EMCON's  registration  statement  is
effective  pursuant to this Section 3, the Management  Stakeholders shall comply
with all applicable EMCON policies  regarding  trading of securities by insiders
and members of management, including the observance of "window period" and other
restrictions.

         4. EMCON REGISTRATION.

             (a) If, at any time after the registration  statement  described in
Section 3 is no longer  effective,  EMCON shall determine to register any of its
securities  either for its own  account or the  account of a security  holder or
holders, other than a registration relating solely to employee benefit plans, or
a registration  relating solely to a Rule 145 transaction,  or a registration on
any registration form that does not permit secondary sales, EMCON will:

                 (i) promptly give to each Management Stakeholder written notice
thereof;

                 (ii) use its best efforts to include in such  registration (and
any related  qualification  under blue sky laws or other compliance),  except as
set forth in Section 4(b) below, and in any underwriting  involved therein,  all
the Management  Shares  specified in a written request or requests,  made by any
Management  Stakeholder  and received by EMCON within twenty (20) days after the
written  notice from EMCON  described in clause (i) above is mailed or delivered
by  EMCON.  Such  written  request  may  specify  all or a part of a  Management
Stakeholder's Management Shares;

                 (iii) furnish such number of  prospectuses  and other documents
incident thereto, including any amendment of or supplement to the prospectus, as
a Management Stakeholder from time to time may reasonably request;

                 (iv)  cause all such EMCON  Common  Stock  registered  pursuant
hereunder to be listed on each securities  exchange on which similar  securities
issued by EMCON are then listed; and

                 (v)   otherwise  use  its  best  efforts  to  comply  with  all
applicable rules and regulations of the Commission.

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             (b) If the  registration  of  which  EMCON  gives  notice  is for a
registered public offering involving an underwriting,  EMCON shall so advise the
Management  Stakeholders  as a part of the  written  notice  given  pursuant  to
Section  4(a)(i).  In such event,  the right of any  Management  Stakeholder  to
registration  pursuant  to  this  Section  4  shall  be  conditioned  upon  such
Management Stakeholder's participation in such underwriting and the inclusion of
such  Management  Stakeholder's  Management  Shares in the  underwriting  to the
extent  provided  herein.  All Management  Stakeholders  proposing to distribute
their securities  through such  underwriting  shall (together with EMCON and the
other  holders of securities of EMCON with  registration  rights to  participate
therein  distributing their securities through such underwriting)  enter into an
underwriting  agreement  in  customary  form  with  the  representative  of  the
underwriter or underwriters selected by EMCON.

             (c)  Notwithstanding  any other provision of this Section 4, if the
representative  of the  underwriters  advises  EMCON in writing  that  marketing
factors  require a limitation  on the number of shares to be  underwritten,  the
representative  may (subject to the limitations set forth below) exclude all the
Management Stakeholders from, or limit the number of the Management Shares to be
included  in,  the  registration  and  underwriting.  EMCON  shall so advise the
Management  Stakeholders  and all other holders of EMCON  securities (the "Other
Shares")  requesting  registration and the number of Management Shares and Other
Shares that may be included shall be allocated among the Management Stakeholders
and other selling  stockholders  requesting  inclusion of shares pro rata on the
basis of the number of Management  Shares and Other Shares that are requested to
be registered.

             (d) EMCON's obligations  pursuant to this Section 4 shall expire as
to each Management  Stakeholder at such time as such Management  Stakeholder may
sell all shares of EMCON Common Stock issued upon  exchange for such  Management
Stakeholder's Note during any successive two quarter period pursuant to Rule 144
under the Securities Act.

         5. EXPENSES OF REGISTRATIOn.  All Registration Expenses (as hereinafter
defined)  incurred  in  connection  with  any  registration,   qualification  or
compliance  pursuant  to  Section 3 and 4 hereof  shall be borne by  EMCON.  All
Selling Expenses (as hereinafter  defined)  relating to securities so registered
shall be borne by the Management Stakeholders who own such Management Shares pro
rata on the basis of the  number of  Management  Shares so  registered  on their
behalf.  For purposes of this Section 5,  Registration  Expenses  shall mean all
expenses  incurred in effecting  any  registration  pursuant to this  Agreement,
including, without limitation, all registration, qualification, and filing fees,
printing  expenses,  escrow fees, fees and  disbursements  of counsel for EMCON,
blue sky fees and  expenses,  and  expenses  of any  regular or  special  audits
incident to or required by any such registration,  but shall not include Selling
Expenses and fees and disbursements of counsel for the Management  Stakeholders.
For  purposes of this Section 5. Selling  Expenses  shall mean all  underwriting
discounts  and  selling  commissions  applicable  to the sale of the  Management
Shares and fees and  disbursements  of counsel  for any  Management  Stakeholder
(other  than the fees and  disbursements  of counsel  included  in  Registration
Expenses).

         6. INDEMNIFICATION.

             (a) EMCON will indemnify each Management  Stakeholder  with respect
to which registration,  qualification,  or compliance has been effected pursuant
to this Agreement,  and each  underwriter,  if any, and each person who controls
within the meaning of Section 15 of the Securities Act, any underwriter, against
all expenses, claims, losses, damages, and liabilities (or actions, proceedings,


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             or settlements in respect  thereof)  arising out of or based on any
untrue  statement (or alleged untrue  statement) of a material fact contained in
any  prospectus  offering  circular,  or other  document  (including any related
registration  statement,  notification,  or  the  like)  incident  to  any  such
registration, qualification, or compliance, or based on any omission (or alleged
omission)  to state  therein a material  fact  required to be stated  therein or
necessary to make the  statements  therein not  misleading,  or any violation by
EMCON of the Securities Act or any rule or regulation  thereunder  applicable to
EMCON and relating to action or inaction  required of EMCON in  connection  with
any such  registration,  qualification,  or compliance,  and will reimburse each
such Management Stakeholder, each such underwriter, and each person who controls
any such underwriter,  for any legal and any other expenses  reasonably incurred
in connection with investigating and defending or settling any such claim, loss,
damage,  liability or action, provided that EMCON will not be liable in any such
case to the extent  that any such claim,  loss,  damage,  liability,  or expense
arises out of or is based on any untrue statement or omission based upon written
information furnished to EMCON by such Management Stakeholder or underwriter and
stated to be  specifically  for use  therein.  It is agreed  that the  indemnity
agreement  contained  in this  Section  6 shall  not  apply to  amounts  paid in
settlement  of any such  loss,  claim,  damage,  liability,  or  action  if such
settlement is effected  without the consent of EMCON (which consent has not been
unreasonably withheld).

             (b) Each Management  Stakeholder will, if Management Shares held by
him or her  are  included  in the  securities  as to  which  such  registration,
qualification,  or compliance is being effected,  indemnify  EMCON,  each of its
directors,   officers,   partners,  legal  counsel,  and  accountants  and  each
underwriter,  if any,  of  EMCON's  securities  covered  by such a  registration
statement, each person who controls EMCON or such underwriter within the meaning
of Section 15 of the  Securities  Act,  and each  other  Management  Stakeholder
against  all claims,  losses,  damages  any  liabilities  (or actions in respect
thereof)  arising out of or based on any untrue  statement  (or  alleged  untrue
statement)  of a material  fact  contained in any such  registration  statement,
prospectus,  offering circular,  or other document,  or any omission (or alleged
omission)  to state  therein a material  fact  required to be stated  therein or
necessary to make the  statements  therein not  misleading,  and will  reimburse
EMCON and such Management  Stakeholders,  directors,  officers,  partners, legal
counsel, and accountants, persons, underwriters or control persons for any legal
or any other expenses  reasonably  incurred in connection with  investigating or
defending any such claim,  loss, damage,  liability,  or action, in each case to
the extent,  but only to the  extent,  that such  untrue  statement  (or alleged
untrue statement) or omission (or alleged omission) is made in such registration
statement, prospectus, offering circular, or other document in reliance upon and
in conformity  with written  information  furnished to EMCON by such  Management
Stakeholder and stated to be  specifically  for use therein  provided,  however,
that the obligations of such Management Stakeholder hereunder shall not apply to
amounts paid in settlement of any such claims,  losses,  damages, or liabilities
(or actions in respect  thereof)  if such  settlement  is  effected  without the
consent of such Management  Stakeholder (which consent shall not be unreasonably
withheld).

             (c) Each party  entitled to  indemnification  under this  Section 6
(the  "Indemnified  Party")  shall give notice to the party  required to provide
indemnification (the "Indemnifying Party") promptly after such Indemnified Party
has actual knowledge of any claim as to which indemnity may be sought, and shall
permit  the  Indemnifying  Party to  assume  the  defense  of such  claim or any
litigation  resulting  therefrom,  provided  that  counsel for the  Indemnifying
Party,  who shall conduct the defense of such claim or any litigation  resulting
therefrom,  shall be approved by the Indemnified Party (whose approval shall not
unreasonably  be withheld),  and the  Indemnified  Party may participate in such
defense at such party's  expense,  and provided  further that the failure of any


                                       73


Indemnified  Party to give  notice as  provided  herein  shall not  relieve  the
Indemnifying  Party of its obligations under this Agreement,  to the extent such
failure is not  prejudicial.  No Indemnifying  Party, in the defense of any such
claim or litigation,  shall,  except with the consent of each Indemnified Party,
consent  to entry of any  judgment  or enter into any  settlement  that does not
include as an unconditional term thereof the giving by the claimant or plaintiff
to such  Indemnified  Party of a release from all liability with respect to such
claim or  litigation.  Each  Indemnified  Party shall  furnish such  information
regarding  itself  or  the  claim  in  question  as an  Indemnifying  Party  may
reasonably request in writing and as shall be reasonably  required in connection
with defense of such claim and litigation resulting therefrom.

             (d) If the  Indemnification  provided for in this Section 6 is held
by a court of competent  jurisdiction to be unavailable to an Indemnified  Party
with  respect to any loss,  liability,  claim,  damage,  or expense  referred to
therein,  then the Indemnifying  Party, in lieu of indemnifying such Indemnified
Party  hereunder,  shall  contribute  to the  amount  paid  or  payable  by such
Indemnified Party as a result of such loss, liability, claim, damage, or expense
in such  proportion  as is  appropriate  to reflect  the  relative  fault of the
Indemnifying  Party on the one hand and of the Indemnified Party on the other in
connection  with  the  statements  or  omissions  that  resulted  in such  loss,
liability,  claim,  damage, or expenses as well as any other relevant  equitable
considerations.  The  relative  fault  of  the  Indemnifying  Party  and  of the
Indemnified  Party shall be  determined  by reference  to,  among other  things,
whether  the  untrue or  alleged  untrue  statement  of a  material  fact or the
omission  to state a  material  fact  relates  to  information  supplied  by the
Indemnifying Party or by the Indemnified Party and the parties' relative intent,
knowledge,  access to  information,  and  opportunity to correct or prevent such
statement or omission.

             (e)  Notwithstanding   the  foregoing,   to  the  extent  that  the
provisions on  indemnification  and  contribution  contained in the underwriting
agreement  entered into in connection with the underwritten  public offering are
in conflict with the  foregoing  provisions,  the provision in the  underwriting
agreement shall control.

         7. RULE 144 REPORTING.  With a view to making available the benefits of
certain  rules and  regulations  of the  Commission  that may permit the sale of
restricted  securities to the public without  registration,  EMCON agrees to use
its best efforts to:

             (a) Make and keep public  information  regarding EMCON available as
those terms are understood and defined in Rule 144 under the Securities Act;

             (b) File with the  Commission  in a timely  manner all  reports and
other  documents  required of EMCON under the  Securities Act and the Securities
Exchange Act of 1934, as amended; and

             (c)  So  long  as a  Management  Stakeholder  owns  any  restricted
securities, furnish to the Management Stakeholder forthwith upon written request
a  written   statement  by  EMCON  as  to  its  compliance  with  the  reporting
requirements of Rule 144; and of the Securities Act and the Exchange Act.

         8. OWT'S REGISTRATION RIGHTS  OBLIGATIONS.  In the event that OWT shall
be  required  to  register  shares of its stock  pursuant  to Section 2.3 of the
Notes, then the provisions of Sections 4 to 7 hereof shall apply with respect to
such registration.

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         9. MISCELLANEOUS.

             (a)   NOTICES.   All   notices,   consents,   waivers,   and  other
communications  under this  Agreement  must be in writing  and will be deemed to
have been duly given when (a)  delivered by hand (with written  confirmation  of
receipt),  (b)  sent by  telecopier  (with  written  confirmation  of  receipt),
provided  that a copy is mailed  within  three (3) business  days by  registered
mail, return receipt requested, (c) when received by the addressee, if sent by a
nationally  recognized  overnight delivery service (receipt  requested),  or (d)
three (3) business days after being sent by registered or certified mail, return
receipt  requested,  in each case to the  appropriate  addresses and  telecopier
numbers set forth below (or to such other addresses and telecopier  numbers as a
party may designate by notice to the other parties):

        Management Stakeholders:     To each  Management  Stakeholder  at the
                                     address set forth on Schedule 1

        EMCON:                       EMCON
                                     400 S. El Camino Real, Suite 1200
                                     San Mateo, California  94402
                                     Attention:  R. Michael Momboisse, Esq.
                                     Fax No.:  (415) 375-0763

             (b)  ENTIRE  AGREEMENT.   This  Agreement  constitutes  the  entire
agreement of the parties with respect to the matters  contemplated  herein. This
Agreement  supersedes any and all prior  understandings as to the subject matter
of this Agreement.

             (c)  AMENDMENTS,  WAIVERS  AND  CONSENTS.  Any  provision  in  this
Agreement  to the  contrary  notwithstanding,  changes in or  additions  to this
Agreement may be made, and compliance with any covenant or provision  herein set
forth  may  be  omitted  or  waived,  if  agreed  to  by  EMCON  and  Management
Stakeholders  holding Notes representing in aggregate in excess of Fifty Percent
(50%) of the aggregate amount due under all of the Notes.

             (d) BINDING  EFFECT;  ASSIGNMENT.  This Agreement  shall be binding
upon and inure to the benefit of the personal  representatives and successors of
the respective parties hereto, except that no Management  Stakeholder shall have
the  right to  assign  its  rights  hereunder  or any  interest  herein  without
obtaining the prior written  consent of EMCON.  Notwithstanding  the  foregoing,
each Management Stakeholder may assign his rights hereunder

                 (i)  to  his  spouse,   parents,   grandparents,   children  or
grandchildren or other family members (including relatives by marriage), or to a
custodian, trustee or other fiduciary for his account or the account of a member
of his family, or

                 (ii) by way of bequest or inheritance upon death.

             (e) GENERAL.  The  headings  contained  in this  Agreement  are for
reference  purposes  only  and  shall  not in any  way  affect  the  meaning  or
interpretation  of this Agreement.  In this Agreement the singular  includes the
plural, the plural the singular.

             (f) SEVERABILITY. If any provision of this Agreement shall be found
by any court of  competent  jurisdiction  to be  invalid or  unenforceable,  the
parties hereby waive such provision to the extent that it is found to be invalid


                                       75


or unenforceable.  Such provision shall, to the maximum extent allowable by law,
be modified  by such court so that it becomes  enforceable,  and,  as  modified,
shall be enforced as any other provision hereof, all the other provisions hereof
continuing in full force and effect.

             (g)  COUNTERPARTS.  This Agreement may be execute in  counterparts,
all of which together shall constitute one and the same instrument.

             (h) GOVERNING LAW. This Agreement shall be governed by the internal
laws of the State of Delaware  without  regard to the  principles of conflict of
laws.

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         IN WITNESS WHEREOF, the parties have caused this Agreement to
be duly executed as of the date first written above.

                       EMCON
                       /s/ R. Michael Momboisse
                       ----------------------------------
                       By: R. MICHAEL MOMBOISSE
                       Title:    CFO and VP Legal

                       ORGANIC WASTE TECHNOLOGIES, INC.
                       /s/ Anthony A. Alexander
                       ----------------------------------
                       By: ANTHONY A. ALEXANDER
                       Title:    Secretary

                       MANAGEMENT STAKEHOLDERS
  
                       /s/Mark H. Shipps
                       ----------------------------------
                       MARK H. SHIPPS

                       /s/Anthony A. Alexander
                       ----------------------------------
                       ANTHONY A. ALEXANDER

                       /s/James Helmick
                       ----------------------------------
                       JAMES HELMICK

                       /s/Raymond J. Nardelli
                       ----------------------------------
                       RAYMOND J. NARDELLI

                       /s/Stephen Lingafelter
                       ----------------------------------
                       STEPHEN LINGAFELTER

                       /s/Randall W. Chapman
                       ----------------------------------
                       RANDALL W. CHAPMAN



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